Magnetic field formation device, power supplying device, power receiving device, power receiving/supplying device, and portable device

Abstract

A magnetic field is formed at a predetermined region. A magnetic field formation device configured to generate a variable magnetic field at a predetermined region A includes: at least one power supplying resonator configured to generate the variable magnetic field; and power-supplying coils configured to generate an induced current in the at least one power supplying resonator, all of the power-supplying coils and the at least one power supplying resonator being disposed so that coil surfaces oppose the predetermined region A, and at least one of the power-supplying coils being disposed to have a coil surface direction which intersects with coil surface directions of the other power-supplying coils.

The invention claimed is: 
     
       1. A magnetic field formation device configured to generate a variable magnetic field at a predetermined region, the magnetic field formation device comprising:
 at least one power supplying resonator configured to generate the variable magnetic field, the at least one power supplying resonator including a coil surface; 
 a plurality of power-supplying coils configured to generate an induced current in the at least one power supplying resonator, each of the plurality of power-supplying coils having a coil surface, all of the plurality of power-supplying coils and the at least one power supplying resonator being disposed so that the respective coil surfaces oppose the predetermined region, and at least one of the plurality of power-supplying coils is disposed so that a coil surface direction intersects with a coil surface direction of at least one of another power-supplying coil of the plurality of power-supplying coils; and 
 a current output controller configured to (i) output a variable current to one output target of a plurality of output targets, which are at least one of and not all of the plurality of power-supplying coils, and (ii) repeatedly switch the one output target to which the variable current is output to another output target of the plurality of output targets. 
 
     
     
       2. The magnetic field formation device according to  claim 1 , wherein:
 all of the power-supplying coils are disposed so that the respective coil surfaces oppose the predetermined region, and 
 the coil surface direction of at least one of the power-supplying coils is disposed to be parallel to the coil surface direction of at least one of another power-supplying coil of the plurality of power-supplying coils. 
 
     
     
       3. The magnetic field formation device according to  claim 1 , wherein the current output controller executes a stop process of not outputting the variable current to any of the plurality of power-supplying coils with a predetermined condition of a timing and a duration. 
     
     
       4. The magnetic field formation device according to  claim 1 , wherein the plurality of power-supplying coils are disposed so that respective outer peripheries of the plurality of power-supplying coils at least partially overlap one another. 
     
     
       5. A power-supplying device comprising the magnetic field formation device according to  claim 1 . 
     
     
       6. A power-receiving device comprising a power-receiving mechanism configured to receive power by the variable magnetic field generated at the predetermined region by the magnetic field formation device of  claim 1 . 
     
     
       7. A power-receiving device configured to receive power by the variable magnetic field generated at the predetermined region by the magnetic field formation device of  claim 1 , the power-receiving device comprising:
 a power-receiving mechanism configured to receive power by the variable magnetic field; and 
 a high-capacitance capacitor having a capacity charged by a current received by the power-receiving mechanism and discharging at least a minimum operating voltage of an electric part on a subsequent stage while an output target of the variable current is switched by a current path switcher. 
 
     
     
       8. A power-receiving device configured to generate a variable magnetic field at a predetermined region by a magnetic field formation device, the magnetic field formation device including (i) at least one power supplying resonator configured to generate the variable magnetic field, the at least one power supplying resonator including a coil surface, (ii) a plurality of power-supplying coils configured to generate an induced current in the at least one power supplying resonator, each of the plurality of power-supplying coils having a coil surface, all of the plurality of power-supplying coils and the at least one power supplying resonator being disposed so that the respective coil surfaces oppose the predetermined region, and (iii) a current output controller configured to output a variable current to one output target of a plurality of output targets, which are at least one of and not all of the plurality of power-supplying coils, and repeatedly switch the one output target to which the variable current is output to another output target of the plurality of output targets, the power-receiving device comprising:
 a power-receiving mechanism configured to receive power by the variable magnetic field; and 
 a high-capacitance capacitor having a capacity charged by a current received by the power-receiving mechanism and discharging at least a minimum operating voltage of an electric part on a subsequent stage while an output target of the variable current is switched by a current path switcher, wherein:
 the high-capacitance capacitor discharges at least the minimum operating voltage of the electric part on the subsequent stage during a stop process in which the current path switcher does not supply the variable current to any of the plurality of power-supplying coils. 
 
 
     
     
       9. A power receiving/supplying device comprising:
 a power-supplying device including the magnetic field formation device according to  claim 1 ; and 
 a power-receiving device including a power-receiving mechanism configured to receive power by the variable magnetic field generated by the power-supplying device. 
 
     
     
       10. A mobile device comprising a power-receiving mechanism configured to receive power by the variable magnetic field generated at the predetermined region by the magnetic field formation device of  claim 1 . 
     
     
       11. The power-receiving device according to  claim 8 , wherein at least one of the plurality of power-supplying coils is disposed so that a coil surface direction intersects with a coil surface direction of at least one of another power-supplying coil of the plurality of power-supplying coils.